I get my nutrients from food and my hydration from water. I have been drinking distilled water for years, with all normal blood lab results...
Drinking distilled water isn’t as bad if you’re eating regular mineral rich food etc, but if you are working epically hard in the sun it will degrade you quickly.
If you were lost in the desert in the summer and had a few 5 gallon containers of it you probably wouldn’t last outside of a couple days without salt and mineral suppliments.